Added robotx.txt, sitemap.xml and meta description

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

assets/tailwind.css

@@ -676,10 +676,6 @@ video {
   display: flex;
 }
 
-.inline-flex {
-  display: inline-flex;
-}
-
 .size-auto {
   width: auto;
   height: auto;
@@ -729,11 +725,6 @@ video {
   width: 0.75rem;
 }
 
-.w-fit {
-  width: -moz-fit-content;
-  width: fit-content;
-}
-
 .w-full {
   width: 100%;
 }
@@ -751,6 +742,10 @@ video {
   max-width: 2rem;
 }
 
+.max-w-md {
+  max-width: 28rem;
+}
+
 .max-w-sm {
   max-width: 24rem;
 }
@@ -759,10 +754,6 @@ video {
   max-width: 36rem;
 }
 
-.max-w-md {
-  max-width: 28rem;
-}
-
 .flex-grow {
   flex-grow: 1;
 }
@@ -783,10 +774,6 @@ video {
   align-items: center;
 }
 
-.justify-start {
-  justify-content: flex-start;
-}
-
 .justify-end {
   justify-content: flex-end;
 }
@@ -815,10 +802,6 @@ video {
   margin-bottom: calc(0.5rem * var(--tw-space-y-reverse));
 }
 
-.overflow-hidden {
-  overflow: hidden;
-}
-
 .overflow-x-auto {
   overflow-x: auto;
 }
@@ -973,10 +956,6 @@ video {
           background-clip: text;
 }
 
-.p-1 {
-  padding: 0.25rem;
-}
-
 .p-3 {
   padding: 0.75rem;
 }
@@ -1303,10 +1282,6 @@ video {
     margin-top: 0px;
   }
 
-  .sm\:max-w-sm {
-    max-width: 24rem;
-  }
-
   .sm\:flex-row {
     flex-direction: row;
   }
@@ -1323,10 +1298,6 @@ video {
 }
 
 @media (min-width: 768px) {
-  .md\:max-w-md {
-    max-width: 28rem;
-  }
-
   .md\:bg-transparent {
     background-color: transparent;
   }
@@ -1353,12 +1324,6 @@ video {
   }
 }
 
-@media (min-width: 1280px) {
-  .xl\:max-w-screen-xl {
-    max-width: 1280px;
-  }
-}
-
 @media (prefers-color-scheme: dark) {
   .dark\:border-gray-600 {
     --tw-border-opacity: 1;